dubbo中ServiceBeanExportedEvent的作用是什么

dubbo中ServiceBeanExportedEvent的作用是什么，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

ServiceBeanExportedEvent

dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/context/event/ServiceBeanExportedEvent.java

public class ServiceBeanExportedEvent extends ApplicationEvent {    /**     * Create a new ApplicationEvent.     *     * @param serviceBean {@link ServiceBean} bean     */    public ServiceBeanExportedEvent(ServiceBean serviceBean) {        super(serviceBean);    }    /**     * Get {@link ServiceBean} instance     *     * @return non-null     */    public ServiceBean getServiceBean() {        return (ServiceBean) super.getSource();    }}

• ServiceBeanExportedEvent继承了ApplicationEvent，其source为ServiceBean

ServiceBean

dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/ServiceBean.java

public class ServiceBean extends ServiceConfig implements InitializingBean, DisposableBean,        ApplicationContextAware, ApplicationListener, BeanNameAware,        ApplicationEventPublisherAware {        //......    /**     * @since 2.6.5     */    @Override    public void export() {        super.export();        // Publish ServiceBeanExportedEvent        publishExportEvent();    }    /**     * @since 2.6.5     */    private void publishExportEvent() {        ServiceBeanExportedEvent exportEvent = new ServiceBeanExportedEvent(this);        applicationEventPublisher.publishEvent(exportEvent);    }        //......}

• ServiceBean的export方法会publishExportEvent

ReferenceAnnotationBeanPostProcessor

dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/beans/factory/annotation/ReferenceAnnotationBeanPostProcessor.java

public class ReferenceAnnotationBeanPostProcessor extends AnnotationInjectedBeanPostProcessor implements        ApplicationContextAware, ApplicationListener {        //......    @Override    public void onApplicationEvent(ApplicationEvent event) {        if (event instanceof ServiceBeanExportedEvent) {            onServiceBeanExportEvent((ServiceBeanExportedEvent) event);        } else if (event instanceof ContextRefreshedEvent) {            onContextRefreshedEvent((ContextRefreshedEvent) event);        }    }    private void onServiceBeanExportEvent(ServiceBeanExportedEvent event) {        ServiceBean serviceBean = event.getServiceBean();        initReferenceBeanInvocationHandler(serviceBean);    }    private void initReferenceBeanInvocationHandler(ServiceBean serviceBean) {        String serviceBeanName = serviceBean.getBeanName();        // Remove ServiceBean when it's exported        ReferenceBeanInvocationHandler handler = localReferenceBeanInvocationHandlerCache.remove(serviceBeanName);        // Initialize        if (handler != null) {            handler.init();        }    }        //......}

• ReferenceAnnotationBeanPostProcessor实现了ApplicationListener的onApplicationEvent方法，接收到ServiceBeanExportedEvent事件时执行onServiceBeanExportEvent，这里从localReferenceBeanInvocationHandlerCache移除，然后执行ReferenceBeanInvocationHandler的init方法

小结

ServiceBeanExportedEvent继承了ApplicationEvent，其source为ServiceBean；ServiceBean的export方法会publishExportEvent；ReferenceAnnotationBeanPostProcessor实现了ApplicationListener的onApplicationEvent方法，接收到ServiceBeanExportedEvent事件时执行onServiceBeanExportEvent，这里从localReferenceBeanInvocationHandlerCache移除，然后执行ReferenceBeanInvocationHandler的init方法

看完上述内容，你们掌握dubbo中ServiceBeanExportedEvent的作用是什么的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注行业资讯频道，感谢各位的阅读！